2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
23 #include <linux/workqueue.h>
24 #include <linux/completion.h>
25 #include <asm/kmap_types.h>
26 #include "bit-radix.h"
27 #include "extent_map.h"
29 struct btrfs_trans_handle;
30 struct btrfs_transaction;
31 extern struct kmem_cache *btrfs_trans_handle_cachep;
32 extern struct kmem_cache *btrfs_transaction_cachep;
33 extern struct kmem_cache *btrfs_bit_radix_cachep;
34 extern struct kmem_cache *btrfs_path_cachep;
36 #define BTRFS_MAGIC "_B2RfS_M"
38 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
39 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
40 #define BTRFS_FS_TREE_OBJECTID 3ULL
41 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
42 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
45 * we can actually store much bigger names, but lets not confuse the rest
48 #define BTRFS_NAME_LEN 255
50 /* 32 bytes in various csum fields */
51 #define BTRFS_CSUM_SIZE 32
52 /* four bytes for CRC32 */
53 #define BTRFS_CRC32_SIZE 4
54 #define BTRFS_EMPTY_DIR_SIZE 6
56 #define BTRFS_FT_UNKNOWN 0
57 #define BTRFS_FT_REG_FILE 1
58 #define BTRFS_FT_DIR 2
59 #define BTRFS_FT_CHRDEV 3
60 #define BTRFS_FT_BLKDEV 4
61 #define BTRFS_FT_FIFO 5
62 #define BTRFS_FT_SOCK 6
63 #define BTRFS_FT_SYMLINK 7
64 #define BTRFS_FT_MAX 8
67 * the key defines the order in the tree, and so it also defines (optimal)
68 * block layout. objectid corresonds to the inode number. The flags
69 * tells us things about the object, and is a kind of stream selector.
70 * so for a given inode, keys with flags of 1 might refer to the inode
71 * data, flags of 2 may point to file data in the btree and flags == 3
72 * may point to extents.
74 * offset is the starting byte offset for this key in the stream.
76 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
77 * in cpu native order. Otherwise they are identical and their sizes
78 * should be the same (ie both packed)
80 struct btrfs_disk_key {
84 } __attribute__ ((__packed__));
90 } __attribute__ ((__packed__));
92 #define BTRFS_FSID_SIZE 16
94 * every tree block (leaf or node) starts with this header.
97 u8 csum[BTRFS_CSUM_SIZE];
98 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
99 __le64 blocknr; /* which block this node is supposed to live in */
105 } __attribute__ ((__packed__));
107 #define BTRFS_MAX_LEVEL 8
108 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
109 sizeof(struct btrfs_header)) / \
110 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
111 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
112 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
113 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
114 sizeof(struct btrfs_item) - \
115 sizeof(struct btrfs_file_extent_item))
118 * the super block basically lists the main trees of the FS
119 * it currently lacks any block count etc etc
121 struct btrfs_super_block {
122 u8 csum[BTRFS_CSUM_SIZE];
123 /* the first 3 fields must match struct btrfs_header */
124 u8 fsid[16]; /* FS specific uuid */
125 __le64 blocknr; /* this block number */
131 __le64 root_dir_objectid;
135 } __attribute__ ((__packed__));
138 * A leaf is full of items. offset and size tell us where to find
139 * the item in the leaf (relative to the start of the data area)
142 struct btrfs_disk_key key;
145 } __attribute__ ((__packed__));
148 * leaves have an item area and a data area:
149 * [item0, item1....itemN] [free space] [dataN...data1, data0]
151 * The data is separate from the items to get the keys closer together
155 struct btrfs_header header;
156 struct btrfs_item items[];
157 } __attribute__ ((__packed__));
160 * all non-leaf blocks are nodes, they hold only keys and pointers to
163 struct btrfs_key_ptr {
164 struct btrfs_disk_key key;
166 } __attribute__ ((__packed__));
169 struct btrfs_header header;
170 struct btrfs_key_ptr ptrs[];
171 } __attribute__ ((__packed__));
174 * btrfs_paths remember the path taken from the root down to the leaf.
175 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
176 * to any other levels that are present.
178 * The slots array records the index of the item or block pointer
179 * used while walking the tree.
182 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
183 int slots[BTRFS_MAX_LEVEL];
189 * items in the extent btree are used to record the objectid of the
190 * owner of the block and the number of references
192 struct btrfs_extent_item {
195 } __attribute__ ((__packed__));
197 struct btrfs_inode_timespec {
200 } __attribute__ ((__packed__));
203 * there is no padding here on purpose. If you want to extent the inode,
204 * make a new item type
206 struct btrfs_inode_item {
218 struct btrfs_inode_timespec atime;
219 struct btrfs_inode_timespec ctime;
220 struct btrfs_inode_timespec mtime;
221 struct btrfs_inode_timespec otime;
222 } __attribute__ ((__packed__));
224 struct btrfs_dir_item {
225 struct btrfs_disk_key location;
229 } __attribute__ ((__packed__));
231 struct btrfs_root_item {
232 struct btrfs_inode_item inode;
239 struct btrfs_disk_key drop_progress;
241 } __attribute__ ((__packed__));
243 #define BTRFS_FILE_EXTENT_REG 0
244 #define BTRFS_FILE_EXTENT_INLINE 1
246 struct btrfs_file_extent_item {
250 * disk space consumed by the extent, checksum blocks are included
254 __le64 disk_num_blocks;
256 * the logical offset in file blocks (no csums)
257 * this extent record is for. This allows a file extent to point
258 * into the middle of an existing extent on disk, sharing it
259 * between two snapshots (useful if some bytes in the middle of the
260 * extent have changed
264 * the logical number of file blocks (no csums included)
267 } __attribute__ ((__packed__));
269 struct btrfs_csum_item {
271 } __attribute__ ((__packed__));
273 /* tag for the radix tree of block groups in ram */
274 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
277 #define BTRFS_BLOCK_GROUP_DATA 1
278 struct btrfs_block_group_item {
281 } __attribute__ ((__packed__));
283 struct btrfs_block_group_cache {
284 struct btrfs_key key;
285 struct btrfs_block_group_item item;
290 struct btrfs_fs_info {
291 u8 fsid[BTRFS_FSID_SIZE];
292 struct btrfs_root *extent_root;
293 struct btrfs_root *tree_root;
294 struct radix_tree_root fs_roots_radix;
296 struct extent_map_tree free_space_cache;
297 struct extent_map_tree block_group_cache;
298 struct extent_map_tree pinned_extents;
299 struct extent_map_tree pending_del;
300 struct extent_map_tree extent_ins;
303 u64 last_trans_committed;
304 struct btrfs_transaction *running_transaction;
305 struct btrfs_super_block super_copy;
306 struct extent_buffer *sb_buffer;
307 struct super_block *sb;
308 struct inode *btree_inode;
309 struct mutex trans_mutex;
310 struct mutex fs_mutex;
311 struct list_head trans_list;
312 struct list_head dead_roots;
313 struct delayed_work trans_work;
314 struct kobject super_kobj;
315 struct completion kobj_unregister;
321 * in ram representation of the tree. extent_root is used for all allocations
322 * and for the extent tree extent_root root.
325 struct extent_buffer *node;
326 struct extent_buffer *commit_root;
327 struct btrfs_root_item root_item;
328 struct btrfs_key root_key;
329 struct btrfs_fs_info *fs_info;
331 struct kobject root_kobj;
332 struct completion kobj_unregister;
333 struct rw_semaphore snap_sem;
337 /* data allocations are done in sectorsize units */
340 /* node allocations are done in nodesize units */
343 /* leaf allocations are done in leafsize units */
348 u64 last_inode_alloc;
350 struct btrfs_key defrag_progress;
357 * inode items have the data typically returned from stat and store other
358 * info about object characteristics. There is one for every file and dir in
361 #define BTRFS_INODE_ITEM_KEY 1
363 /* reserve 2-15 close to the inode for later flexibility */
366 * dir items are the name -> inode pointers in a directory. There is one
367 * for every name in a directory.
369 #define BTRFS_DIR_ITEM_KEY 16
370 #define BTRFS_DIR_INDEX_KEY 17
372 * extent data is for file data
374 #define BTRFS_EXTENT_DATA_KEY 18
376 * csum items have the checksums for data in the extents
378 #define BTRFS_CSUM_ITEM_KEY 19
380 /* reserve 20-31 for other file stuff */
383 * root items point to tree roots. There are typically in the root
384 * tree used by the super block to find all the other trees
386 #define BTRFS_ROOT_ITEM_KEY 32
388 * extent items are in the extent map tree. These record which blocks
389 * are used, and how many references there are to each block
391 #define BTRFS_EXTENT_ITEM_KEY 33
394 * block groups give us hints into the extent allocation trees. Which
395 * blocks are free etc etc
397 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
400 * string items are for debugging. They just store a short string of
403 #define BTRFS_STRING_ITEM_KEY 253
405 /* some macros to generate set/get funcs for the struct fields. This
406 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
409 #define le8_to_cpu(v) (v)
410 #define cpu_to_le8(v) (v)
413 #define read_eb_member(eb, ptr, type, member, result) ( \
414 read_extent_buffer(eb, (char *)(result), \
415 ((unsigned long)(ptr)) + \
416 offsetof(type, member), \
417 sizeof(((type *)0)->member)))
419 #define write_eb_member(eb, ptr, type, member, result) ( \
420 write_extent_buffer(eb, (char *)(result), \
421 ((unsigned long)(ptr)) + \
422 offsetof(type, member), \
423 sizeof(((type *)0)->member)))
425 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
426 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
432 unsigned long map_start; \
433 unsigned long map_len; \
434 unsigned long offset = (unsigned long)s + \
435 offsetof(type, member); \
436 err = map_extent_buffer(eb, offset, \
437 sizeof(((type *)0)->member), \
438 &map_token, &kaddr, \
439 &map_start, &map_len, KM_USER0); \
441 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
443 u##bits res = le##bits##_to_cpu(*tmp); \
444 unmap_extent_buffer(eb, map_token, KM_USER0); \
448 read_eb_member(eb, s, type, member, &res); \
449 return le##bits##_to_cpu(res); \
452 static inline void btrfs_set_##name(struct extent_buffer *eb, \
453 type *s, u##bits val) \
458 unsigned long map_start; \
459 unsigned long map_len; \
460 unsigned long offset = (unsigned long)s + \
461 offsetof(type, member); \
462 err = map_extent_buffer(eb, offset, \
463 sizeof(((type *)0)->member), \
464 &map_token, &kaddr, \
465 &map_start, &map_len, KM_USER0); \
467 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
469 *tmp = cpu_to_le##bits(val); \
470 unmap_extent_buffer(eb, map_token, KM_USER0); \
472 val = cpu_to_le##bits(val); \
473 write_eb_member(eb, s, type, member, &val); \
477 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
478 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
483 unsigned long map_start; \
484 unsigned long map_len; \
485 unsigned long offset = offsetof(type, member); \
486 err = map_extent_buffer(eb, offset, \
487 sizeof(((type *)0)->member), \
488 &map_token, &kaddr, \
489 &map_start, &map_len, KM_USER0); \
491 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
493 u##bits res = le##bits##_to_cpu(*tmp); \
494 unmap_extent_buffer(eb, map_token, KM_USER0); \
498 read_eb_member(eb, NULL, type, member, &res); \
499 return le##bits##_to_cpu(res); \
502 static inline void btrfs_set_##name(struct extent_buffer *eb, \
508 unsigned long map_start; \
509 unsigned long map_len; \
510 unsigned long offset = offsetof(type, member); \
511 err = map_extent_buffer(eb, offset, \
512 sizeof(((type *)0)->member), \
513 &map_token, &kaddr, \
514 &map_start, &map_len, KM_USER0); \
516 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
518 *tmp = cpu_to_le##bits(val); \
519 unmap_extent_buffer(eb, map_token, KM_USER0); \
521 val = cpu_to_le##bits(val); \
522 write_eb_member(eb, NULL, type, member, &val); \
526 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
527 static inline u##bits btrfs_##name(type *s) \
529 return le##bits##_to_cpu(s->member); \
531 static inline void btrfs_set_##name(type *s, u##bits val) \
533 s->member = cpu_to_le##bits(val); \
536 /* struct btrfs_block_group_item */
537 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
539 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
542 /* struct btrfs_inode_item */
543 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
544 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
545 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
546 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
547 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
548 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
549 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
550 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
551 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
552 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
553 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
556 static inline struct btrfs_inode_timespec *
557 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
559 unsigned long ptr = (unsigned long)inode_item;
560 ptr += offsetof(struct btrfs_inode_item, atime);
561 return (struct btrfs_inode_timespec *)ptr;
564 static inline struct btrfs_inode_timespec *
565 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
567 unsigned long ptr = (unsigned long)inode_item;
568 ptr += offsetof(struct btrfs_inode_item, mtime);
569 return (struct btrfs_inode_timespec *)ptr;
572 static inline struct btrfs_inode_timespec *
573 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
575 unsigned long ptr = (unsigned long)inode_item;
576 ptr += offsetof(struct btrfs_inode_item, ctime);
577 return (struct btrfs_inode_timespec *)ptr;
580 static inline struct btrfs_inode_timespec *
581 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
583 unsigned long ptr = (unsigned long)inode_item;
584 ptr += offsetof(struct btrfs_inode_item, otime);
585 return (struct btrfs_inode_timespec *)ptr;
588 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
589 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
591 /* struct btrfs_extent_item */
592 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
593 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 32);
595 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
597 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
600 /* struct btrfs_node */
601 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
603 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
606 ptr = offsetof(struct btrfs_node, ptrs) +
607 sizeof(struct btrfs_key_ptr) * nr;
608 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
611 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
615 ptr = offsetof(struct btrfs_node, ptrs) +
616 sizeof(struct btrfs_key_ptr) * nr;
617 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
620 static unsigned long btrfs_node_key_ptr_offset(int nr)
622 return offsetof(struct btrfs_node, ptrs) +
623 sizeof(struct btrfs_key_ptr) * nr;
626 static void btrfs_node_key(struct extent_buffer *eb,
627 struct btrfs_disk_key *disk_key, int nr)
630 ptr = btrfs_node_key_ptr_offset(nr);
631 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
632 struct btrfs_key_ptr, key, disk_key);
634 static inline void btrfs_set_node_key(struct extent_buffer *eb,
635 struct btrfs_disk_key *disk_key, int nr)
638 ptr = btrfs_node_key_ptr_offset(nr);
639 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
640 struct btrfs_key_ptr, key, disk_key);
643 /* struct btrfs_item */
644 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
645 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
647 static inline unsigned long btrfs_item_nr_offset(int nr)
649 return offsetof(struct btrfs_leaf, items) +
650 sizeof(struct btrfs_item) * nr;
653 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
656 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
659 static inline u32 btrfs_item_end(struct extent_buffer *eb,
660 struct btrfs_item *item)
662 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
665 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
667 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
670 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
672 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
675 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
677 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
680 static inline void btrfs_item_key(struct extent_buffer *eb,
681 struct btrfs_disk_key *disk_key, int nr)
683 struct btrfs_item *item = btrfs_item_nr(eb, nr);
684 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
687 static inline void btrfs_set_item_key(struct extent_buffer *eb,
688 struct btrfs_disk_key *disk_key, int nr)
690 struct btrfs_item *item = btrfs_item_nr(eb, nr);
691 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
694 /* struct btrfs_dir_item */
695 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
696 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
697 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
699 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
700 struct btrfs_dir_item *item,
701 struct btrfs_disk_key *key)
703 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
706 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
707 struct btrfs_dir_item *item,
708 struct btrfs_disk_key *key)
710 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
713 /* struct btrfs_disk_key */
714 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
716 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
717 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
719 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
720 struct btrfs_disk_key *disk)
722 cpu->offset = le64_to_cpu(disk->offset);
723 cpu->type = disk->type;
724 cpu->objectid = le64_to_cpu(disk->objectid);
727 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
728 struct btrfs_key *cpu)
730 disk->offset = cpu_to_le64(cpu->offset);
731 disk->type = cpu->type;
732 disk->objectid = cpu_to_le64(cpu->objectid);
735 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
736 struct btrfs_key *key, int nr)
738 struct btrfs_disk_key disk_key;
739 btrfs_node_key(eb, &disk_key, nr);
740 btrfs_disk_key_to_cpu(key, &disk_key);
743 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
744 struct btrfs_key *key, int nr)
746 struct btrfs_disk_key disk_key;
747 btrfs_item_key(eb, &disk_key, nr);
748 btrfs_disk_key_to_cpu(key, &disk_key);
751 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
752 struct btrfs_dir_item *item,
753 struct btrfs_key *key)
755 struct btrfs_disk_key disk_key;
756 btrfs_dir_item_key(eb, item, &disk_key);
757 btrfs_disk_key_to_cpu(key, &disk_key);
761 static inline u8 btrfs_key_type(struct btrfs_key *key)
766 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
771 /* struct btrfs_header */
772 BTRFS_SETGET_HEADER_FUNCS(header_blocknr, struct btrfs_header, blocknr, 64);
773 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
775 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
776 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
777 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
778 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
780 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
782 unsigned long ptr = offsetof(struct btrfs_header, fsid);
786 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
788 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
792 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
794 unsigned long ptr = offsetof(struct btrfs_header, csum);
798 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
803 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
808 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
813 static inline int btrfs_is_leaf(struct extent_buffer *eb)
815 return (btrfs_header_level(eb) == 0);
818 /* struct btrfs_root_item */
819 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
820 BTRFS_SETGET_FUNCS(disk_root_blocknr, struct btrfs_root_item, blocknr, 64);
822 BTRFS_SETGET_STACK_FUNCS(root_blocknr, struct btrfs_root_item, blocknr, 64);
823 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
824 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
825 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
826 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, blocks_used, 64);
827 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, block_limit, 64);
829 /* struct btrfs_super_block */
830 BTRFS_SETGET_STACK_FUNCS(super_blocknr, struct btrfs_super_block, blocknr, 64);
831 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
833 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
834 BTRFS_SETGET_STACK_FUNCS(super_total_blocks, struct btrfs_super_block,
836 BTRFS_SETGET_STACK_FUNCS(super_blocks_used, struct btrfs_super_block,
838 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
840 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
842 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
844 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
845 root_dir_objectid, 64);
847 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
849 return offsetof(struct btrfs_leaf, items);
852 /* struct btrfs_file_extent_item */
853 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
855 static inline unsigned long btrfs_file_extent_inline_start(struct
856 btrfs_file_extent_item *e)
858 unsigned long offset = (unsigned long)e;
859 offset += offsetof(struct btrfs_file_extent_item, disk_blocknr);
863 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
865 return offsetof(struct btrfs_file_extent_item, disk_blocknr) + datasize;
868 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
869 struct btrfs_item *e)
871 unsigned long offset;
872 offset = offsetof(struct btrfs_file_extent_item, disk_blocknr);
873 return btrfs_item_size(eb, e) - offset;
876 BTRFS_SETGET_FUNCS(file_extent_disk_blocknr, struct btrfs_file_extent_item,
878 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
880 BTRFS_SETGET_FUNCS(file_extent_disk_num_blocks, struct btrfs_file_extent_item,
881 disk_num_blocks, 64);
882 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
884 BTRFS_SETGET_FUNCS(file_extent_num_blocks, struct btrfs_file_extent_item,
887 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
889 return sb->s_fs_info;
892 static inline int btrfs_set_root_name(struct btrfs_root *root,
893 const char *name, int len)
895 /* if we already have a name just free it */
899 root->name = kmalloc(len+1, GFP_KERNEL);
903 memcpy(root->name, name, len);
904 root->name[len] ='\0';
909 /* helper function to cast into the data area of the leaf. */
910 #define btrfs_item_ptr(leaf, slot, type) \
911 ((type *)(btrfs_leaf_data(leaf) + \
912 btrfs_item_offset_nr(leaf, slot)))
914 #define btrfs_item_ptr_offset(leaf, slot) \
915 ((unsigned long)(btrfs_leaf_data(leaf) + \
916 btrfs_item_offset_nr(leaf, slot)))
918 /* mount option defines and helpers */
919 #define BTRFS_MOUNT_SUBVOL 0x000001
920 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
921 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
922 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
925 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
926 struct btrfs_root *root);
927 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
928 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
931 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
932 struct btrfs_block_group_cache
933 *hint, u64 search_start,
934 int data, int owner);
935 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
936 struct btrfs_root *root);
937 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
938 struct btrfs_root *root, u64 hint,
940 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
941 struct btrfs_root *root, u64 owner,
942 u64 num_blocks, u64 empty_size, u64 search_start,
943 u64 search_end, struct btrfs_key *ins, int data);
944 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
945 struct extent_buffer *buf);
946 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
947 *root, u64 blocknr, u64 num_blocks, int pin);
948 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
949 struct btrfs_root *root,
950 struct extent_map_tree *unpin);
951 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
952 struct btrfs_root *root,
953 u64 blocknr, u64 num_blocks);
954 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
955 struct btrfs_root *root);
956 int btrfs_free_block_groups(struct btrfs_fs_info *info);
957 int btrfs_read_block_groups(struct btrfs_root *root);
959 int btrfs_cow_block(struct btrfs_trans_handle *trans,
960 struct btrfs_root *root, struct extent_buffer *buf,
961 struct extent_buffer *parent, int parent_slot,
962 struct extent_buffer **cow_ret);
963 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
964 *root, struct btrfs_path *path, u32 data_size);
965 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
966 struct btrfs_root *root,
967 struct btrfs_path *path,
969 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
970 *root, struct btrfs_key *key, struct btrfs_path *p, int
972 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
973 struct btrfs_root *root, struct extent_buffer *parent,
974 int cache_only, u64 *last_ret);
975 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
976 struct btrfs_path *btrfs_alloc_path(void);
977 void btrfs_free_path(struct btrfs_path *p);
978 void btrfs_init_path(struct btrfs_path *p);
979 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
980 struct btrfs_path *path);
981 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
982 *root, struct btrfs_key *key, void *data, u32 data_size);
983 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
984 *root, struct btrfs_path *path, struct btrfs_key
985 *cpu_key, u32 data_size);
986 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
987 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
988 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
991 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
992 struct btrfs_key *key);
993 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
994 *root, struct btrfs_key *key, struct btrfs_root_item
996 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
997 *root, struct btrfs_key *key, struct btrfs_root_item
999 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1000 btrfs_root_item *item, struct btrfs_key *key);
1001 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1002 struct btrfs_root *latest_root);
1004 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1005 *root, const char *name, int name_len, u64 dir,
1006 struct btrfs_key *location, u8 type);
1007 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1008 struct btrfs_root *root,
1009 struct btrfs_path *path, u64 dir,
1010 const char *name, int name_len,
1012 struct btrfs_dir_item *
1013 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1014 struct btrfs_root *root,
1015 struct btrfs_path *path, u64 dir,
1016 u64 objectid, const char *name, int name_len,
1018 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1019 struct btrfs_path *path,
1020 const char *name, int name_len);
1021 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1022 struct btrfs_root *root,
1023 struct btrfs_path *path,
1024 struct btrfs_dir_item *di);
1026 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1027 struct btrfs_root *fs_root,
1028 u64 dirid, u64 *objectid);
1029 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1032 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1033 struct btrfs_root *root,
1034 struct btrfs_path *path, u64 objectid);
1035 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1036 *root, struct btrfs_path *path,
1037 struct btrfs_key *location, int mod);
1040 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1041 struct btrfs_root *root,
1042 u64 objectid, u64 pos, u64 offset,
1043 u64 disk_num_blocks,
1045 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1046 struct btrfs_root *root,
1047 struct btrfs_path *path, u64 objectid,
1048 u64 blocknr, int mod);
1049 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1050 struct btrfs_root *root,
1051 u64 objectid, u64 offset,
1052 char *data, size_t len);
1053 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1054 struct btrfs_root *root,
1055 struct btrfs_path *path,
1056 u64 objectid, u64 offset,
1058 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1059 struct btrfs_root *root, struct btrfs_path *path,
1062 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1063 int btrfs_readpage(struct file *file, struct page *page);
1064 void btrfs_delete_inode(struct inode *inode);
1065 void btrfs_read_locked_inode(struct inode *inode);
1066 int btrfs_write_inode(struct inode *inode, int wait);
1067 void btrfs_dirty_inode(struct inode *inode);
1068 struct inode *btrfs_alloc_inode(struct super_block *sb);
1069 void btrfs_destroy_inode(struct inode *inode);
1070 int btrfs_init_cachep(void);
1071 void btrfs_destroy_cachep(void);
1072 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1073 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1074 struct btrfs_root *root);
1075 int btrfs_commit_write(struct file *file, struct page *page,
1076 unsigned from, unsigned to);
1077 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1078 size_t page_offset, u64 start, u64 end,
1080 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1081 struct btrfs_root *root,
1082 struct inode *inode);
1084 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1085 extern struct file_operations btrfs_file_operations;
1086 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1087 struct btrfs_root *root, struct inode *inode,
1088 u64 start, u64 end, u64 *hint_block);
1090 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1091 struct btrfs_root *root, int cache_only);
1094 int btrfs_init_sysfs(void);
1095 void btrfs_exit_sysfs(void);
1096 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1097 int btrfs_sysfs_add_root(struct btrfs_root *root);
1098 void btrfs_sysfs_del_root(struct btrfs_root *root);
1099 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);